Legendre pair of length 7777 using complementary binary matrices with fixed marginals

preprint2021arXivOpen access

Abstract

We provide a search method for Legendre pairs of composite length based on generating binary matrices with fixed row and column sums from compressed, complementary integer vectors. This approach yielded the first construction of a Legendre pair of length 7777, as well as the first exhaustive generation of Legendre pairs of length 5555.

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